A380361 - cp's OEIS frontend

A380361 Triangle read by rows: T(n,k) is the number of embeddings on the sphere of Halin graphs on n unlabeled nodes with circuit rank k up to orientation-preserving homeomorphisms, 3 <= k <= n-1.

n	a(n)
4	1
5	0
6	1
7	0
8	1
9	1
10	0
11	0
12	1
13	1
14	0
15	0
16	1
17	2
18	1
19	0
20	0
21	0
22	4
23	2
24	1
25	0
26	0
27	0
28	4
29	8
30	3
31	1
32	0
33	0
34	0
35	0
36	12
37	16
38	3
39	1
40	0
41	0
42	0
43	0
44	6
45	40
46	25
47	4
48	1
49	0
50	0
51	0
52	0
53	0
54	43
55	93
56	40
57	4
58	1
59	0
60	0
61	0
62	0
63	0
64	19
65	165
66	197
67	56
68	5
69	1
70	0
71	0
72	0
73	0
74	0
75	0
76	143
77	505
78	364
79	80
80	5
81	1

[1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 2, 1, 0, 0, 0, 4, 2, 1, 0, 0, 0, 4, 8, 3, 1, 0, 0, 0, 0, 12, 16, 3, 1, 0, 0, 0, 0, 6, 40, 25, 4, 1, 0, 0, 0, 0, 0, 43, 93, 40, 4, 1, 0, 0, 0, 0, 0, 19, 165, 197, 56, 5, 1, 0, 0, 0, 0, 0, 0, 143, 505, 364, 80, 5, 1]

cp's OEIS Frontend

A380361 Triangle read by rows: T(n,k) is the number of embeddings on the sphere of Halin graphs on n unlabeled nodes with circuit rank k up to orientation-preserving homeomorphisms, 3 <= k <= n-1.

Table of values

List of values

n	a(n)
4	1
5	0
6	1
7	0
8	1
9	1
10	0
11	0
12	1
13	1
14	0
15	0
16	1
17	2
18	1
19	0
20	0
21	0
22	4
23	2
24	1
25	0
26	0
27	0
28	4
29	8
30	3
31	1
32	0
33	0
34	0
35	0
36	12
37	16
38	3
39	1
40	0
41	0
42	0
43	0
44	6
45	40
46	25
47	4
48	1
49	0
50	0
51	0
52	0
53	0
54	43
55	93
56	40
57	4
58	1
59	0
60	0
61	0
62	0
63	0
64	19
65	165
66	197
67	56
68	5
69	1
70	0
71	0
72	0
73	0
74	0
75	0
76	143
77	505
78	364
79	80
80	5
81	1

n	a(n)
4	1
5	0
6	1
7	0
8	1
9	1
10	0
11	0
12	1
13	1
14	0
15	0
16	1
17	2
18	1
19	0
20	0
21	0
22	4
23	2
24	1
25	0
26	0
27	0
28	4
29	8
30	3
31	1
32	0
33	0
34	0
35	0
36	12
37	16
38	3
39	1
40	0
41	0
42	0
43	0
44	6
45	40
46	25
47	4
48	1
49	0
50	0
51	0
52	0
53	0
54	43
55	93
56	40
57	4
58	1
59	0
60	0
61	0
62	0
63	0
64	19
65	165
66	197
67	56
68	5
69	1
70	0
71	0
72	0
73	0
74	0
75	0
76	143
77	505
78	364
79	80
80	5
81	1

n	a(n)
4	1
5	0
6	1
7	0
8	1
9	1
10	0
11	0
12	1
13	1
14	0
15	0
16	1
17	2
18	1
19	0
20	0
21	0
22	4
23	2
24	1
25	0
26	0
27	0
28	4
29	8
30	3
31	1
32	0
33	0
34	0
35	0
36	12
37	16
38	3
39	1
40	0
41	0
42	0
43	0
44	6
45	40
46	25
47	4
48	1
49	0
50	0
51	0
52	0
53	0
54	43
55	93
56	40
57	4
58	1
59	0
60	0
61	0
62	0
63	0
64	19
65	165
66	197
67	56
68	5
69	1
70	0
71	0
72	0
73	0
74	0
75	0
76	143
77	505
78	364
79	80
80	5
81	1